Boiler



Patented Nov. 17, 1931 UNITED STATES PATENT OFFICE JOHN 'VAN BRU'NT, OF FLUSHING, NEW YORK, ASSIGNOR T0 INTERNATIONAL COM- BUSTION ENGINEERING: CORPORATION, F NEW YORK, N. Y., A CORPORATION OF DELAWARE BOILER Application lled December 31, 1928.' Serial No. 329,650.

This invention relates to improvements in' boilers and is especially useful in connection with boilers of the bent tube type with upper steam and water and mud drums, such as the Stirling type. v

It is now customary to operate boiler installations at very high ratings compared to standard practice a few years ago. It is also the practice now to increase capacity by providing water walls largely defining the com-.

bustion space of the boiler furnace.

There are, however, difficulties encountered in such arrangements, such, for example, as maintaining proper levels in the steam and water drums, wet steam, and the like.

It is the primary object of the invention to overcome these diiiiculties.

How the foregoing, together with such other objects as may hereinafter appear, or are incident to the invention, are realized is illustrated in the accompanying drawing, wherein- The figure is a vertical section through an installation embodying my improvements.

Referring to the drawing the reference character A denotes the boiler which has the front steam and Water drum 7 and a middle steam and water drum 8 and a rear steam and water drum 9; a main mud drum 10, a second mud drum 11, and connecting banks of tubes a, b, c, d, preferably batlied to provide up and down passes.

Steam circulators 12 and water circulators 13 connect 'the three steam and water drums.

The furnace B is located in front and beneath the boiler and the combustion spacethereof is largely defined by Water walls. The furnace is preferably fired through what would normally be regarded as the rear wall 14 with powdered coal or the like.v The opposite wall 15 has a row of upright spaced tubes 16 extending thereover, the upper and lower ends of such tubes extending to the eX- teriorf for connection to the header 17 and junction boxes 18. The tubes are preferably finned. Extending from the header 17 to the front steam drum 7 is another row of finned tubes 19 also exposed to radiant'heat. A portion of each side wall is also covered by water walls, each side water wall compris- .ing a main section 20 and a second section 21,

the latter being located in that portion of the side wall going beneath the arch 22. The tubes of the sections 20 and 21 are connected '55 at their lower ends to the header 23. The tubes of the section 2O areconnected at their upper ends to the header 24 and the tubes of the section 21 are connected at their upper ends to the header 25. The headers 23, 24 and 60 25 are located exterior of the furnace.

Above the ash pit 26 I provide a screen of relatively widely spaced tubes 27, the lower ends of which are connected into the header 28 and the upper ends of which connect with 05 the junction boxes 18.

A row of tubes 29 extend over the inner face of and support the arch 22, the lower ends of said tubes being connected to a header 30 and the upper ends thereof in a manner to be hereinafter described.

It will be seen from the foregoing that a very large portion of the combustion space is defined by tubes subject to radiant heat. The manner of connecting these tubes into the cir- 7 culation of the boiler so as to permit of opera'- tion at high ratings andthe development of high capacity will now be described. The header 30 is supplied from the mud drum 10 by means of pipes 31, and the steam and water 30. generated in the pipes 29 is delivered to the middle steam and water drum 8 through the medium of tubes of the bank B by means ofconnectors 32 which connect the upper ends of the tubes 29 with tubes of the bank B inside l" the mud drum- 10. The header 28 is supplied from the mud drum 10 by means of the large downcomer 33 connected at its top to the header 34, in turn connected by a number of small tubes 34a to the drum 10. Circulation is downward from the drum 10 to the header 28, through the tubes 27, through'the tubes 16 and through the tubes 19 to thel frontsteam and water drum 7. The headers 23 of the 95 side water walls are supplied from the front steam and water drum 7 by means of the downcomers 35 provided in any desired num- All ber, preferably located outside of the furnace. Delivery from the headers 24 and 25 is loo to the middle steam and water drum 8 by means of the upcomers 36.

F rom the foregoing it will be seen that the arch tubes 29 receive their supply from the drum l0, but deliver to the drum 8; the tubes 27, 16 and 19 receive their supply from the drum l0 but deliver to the front drum 7; while the side wall sections receive their supply of water from the front drums 7 but deliver to the drum 8.

Feed water is supplied to the drum 11, making the rear bank of tubes d largely an economizer section. The middle drum 8 is preferably larger than the drums 7 and 9 and the drum 9 is preferably larger than the drum 7, and steam is taken from the drum 9.

By the foregoing arrangement I am enabled to keep proper water levels in the various drums and ensure effective circulation and relatively dry steam. If there is any tendency towards hysteria in the circulation in the side walls, this may be overcome by providing return tubes 87 connecting the headers 24 and 25 with the header 23. These return tubes are to be located outside of the furnace.

I claim:

1. In combination, a Stirling type boiler having three steam and water drums connected by circulators, a mud drum, banks of tubes connecting the 'mud drum and the steam and water drums, a combustion chamber in front of and below the boiler, a row of upright boiler tubes on one upright wall of the chamber connected to receive its supply from the mud drum and to deliver to the front steam and water drum, and a row of upright tubes on each of two other walls of the chamber connected to receive their supply from the front steam drum and to deliver to the middle steam and water drum, and means for withdrawing steam from the rear steam and water drum.

2. In combination, a Stirling type boiler having three steam and water drums connected by circulators, Ya mud drum, banks of tubes connecting the mud drum and the steam and water drums, a combustion chamber in front of and below the boiler, a row of upright boiler tubes on one upright wall of the chamber connected to receive its supply from the mud drum and to deliver to the front steam and water drum, and a row of upright tubes on each of two other walls of the chamber connected to receive their supply from the front steam drum and to deliver to the middle steam and water drum, and means for withdrawing steam from the rear steam and water drum, the middle-steam and water drum being larger than the two other steam and water drums.

3. In combination, a Stirling type boiler having three steam and water drums connect-` ed by circulators, a mud drum, banks of tubes a connecting the mud drum and the steam and water drums, a combustion chamber in front of and below the boiler, a row of upright boiler tubes on one upright wall of the chamber connected to receive its supply from the mud drum and to deliver to the front steam and water drum, and a row of upright tubes on each of two other walls of the chamber connected to receive their supply from the front steam drum and to deliver to the middle steam` and water drum, and means for withdrawing steam from the rear steam and water drum, together with arch tubes connected to receive their supply from the mud drum and to deliver to the middle steam and water drum.

4. In combination, a Stirling type boiler having three steam and water drums connected by circulators, a mud drum, banks of tubes connecting the mud drum and the steam and water drums, a combustion chamber in front of and below the boiler, a row of upright boiler tubes on one upright wall of the chamber connected to receive its supply from the mud drum and to deliver to the front steam and water drum, and a row of upright tubes on each of two other walls of the chamber connected to receive their supply from the front steam drum and to deliver to a steam and Water drum other than the rear steam and water drum, and means for withdrawing steam from the rear steam and water drum.

In testimony whereof I have hereunto signed my name.

JOHN VAN BRUNT. 

